5
REASSEMBLY OF BEARING AND MECHANICAL SHAFT SEAL
1. Clean the power rotor shaft and snap ring grooves prior to installing the new seal and bearing. Wash the
shaft in solvent to remove dirt and grease. Use only new bearing, seal and retaining rings.
2. Place the spring holder and spring on the shaft. Make sure that retaining ring (35) furnished on rotor size
250 and seal spacer (38) for rotor size 275 and 350 is installed on power rotor. Place the spring holder and
spring on rotor shaft.
3. Lubricate the shaft with clean hydraulic fluid.
4. Grasp the seal subassembly, using a rotating motion, gently slide the seal subassembly over the shaft.
Use care not to cut the flexible diaphragm and drive ring. A piece of shim stock wrapped around the power
rotor shaft to cover the snap ring grooves and shoulder of the seal diameter may be used for this purpose.
If shim stock is used, twist the seal subassembly in the same direction as the wrap of the shim stock when
installing it.
5. Insert seal gasket furnished with new mechanical seal into the bore of inboard end cover (46). Clean and
lubricate the face of the carbon ring in the mechanical seal and place the stationary seat and bearing
spacer on the power rotor.
6. Install inner retaining ring.
7. Place the ball bearing on the shaft. Using a hollow tube and pressing on the inner race, set the bearing
firmly against the inner retaining ring (Figure 2). Do not press the bearing on the outer race!
8. Check the mechanical seal. Referring to (Figure 3), the flexible diaphragm must show evenly above the
drive ring, and the drive lugs on the retainer must engage the drive ring to their full length. Adjust the
mechanical seal if necessary.
9. Install the outer retaining ring (13).
10. With a clockwise rotating motion insert power rotor assembly into pump.
11. Install bearing retainer (17).
12. Install hex bolts (18) and torque per Table 2.
Figure 3 – Mechanical Seal Assembly
Figure 2
